Thermal Gradients
Mostrando 1-12 de 62 artigos, teses e dissertações.
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1. Finite element computational development for thermo-mechanical analysis of plane steel structures exposed to fire
Abstract This article presents a numerical formulation based on finite element procedures for application in nonlinear thermo-mechanical analyses of steel planar structures under fire condition. The mechanical properties of structural elements degrade when subjected to high temperatures, resulting in significant reductions in strength and stiffness. Under th
REM - International Engineering Journal. Publicado em: 2022
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2. Experimental Thermal Analysis in Rotary Friction Welding of Dissimilar Materials
ABSTRACT: Rotary friction welding process (RFW) is one of the most used processes in the world for manufacturing bimetallic components that require high mechanical strength. All process occurs in solid state at temperatures below the melting point of the involved materials, having as the main bonding mechanisms the diffusion and mechanical mixture. The purpo
J. Aerosp. Technol. Manag.. Publicado em: 23/09/2019
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3. Utilização da termografia infravermelha para detecção de focos de umidade em paredes internas de edificações
Resumo O uso da termografia infravermelha tem se tornado alvo de estudos em várias áreas dentro da construção civil. Contudo, as pesquisas de detecção de presença de umidade em edificações ainda estão em desenvolvimento. O objetivo principal deste artigofoi estudar a viabilidadedo uso da termografia para a detecção de infiltrações devido a caus
Ambient. constr.. Publicado em: 2019-03
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4. Effect of blisters and rims on radial hydride precipitation in fuel elements under dry storage conditions
ABSTRACT Hydrogen enters in Zry clads during fuel element life in service; when hydrogen exceeds the terminal solid solubility, circumferential hydrides are precipitated. In the presence of thermal gradients, produced for instance by oxide spallation, localized concentration of hydrides - known as blisters - can be formed. Due to the fact that zirconium hydr
Matéria (Rio J.). Publicado em: 19/07/2018
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5. Movimiento de las interfases durante la solidificación horizontal de aleaciones estaño-zinc
ABSTRACT Solidification processing is one of the important routes to produce materials, especially metals and alloys. The parameters for the transformation from liquid to solid, such as the temperature gradient, the growth rate, the cooling rate, the interphase velocity, vary from process to process and in one process also as a function of time and space. Th
Matéria (Rio J.). Publicado em: 19/07/2018
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6. Thermal gradients of container and mean surface temperature of broiler chicks transported on different shipments
ABSTRACT This study aimed to evaluate the thermal gradients between the container environment and the interior of chick boxes and mean surface temperature of broiler chicks during transportation on different shipments. The research was conducted in the state of São Paulo, Brazil, with the accompaniment of nine shipments with different density boxes, using a
Eng. Agríc.. Publicado em: 2016-08
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7. Design of a new high lateral resistance sleeper and performance comparison with conventional sleepers in a curved railway track by means of finite element models
The lack of lateral resistance in a curved railway track can produce misalignment problems due to the centrifugal forces when the trains pass through. Moreover, most of the times continuous welded rails (CWR) are used in nowadays railway tracks, which can induce the track buckling as a result of thermal loads caused by high temperature gradients. A new sleep
Lat. Am. j. solids struct.. Publicado em: 2014-12
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8. X-Ray diffraction technique applied to study of residual stresses after welding of duplex stainless steel plates
Duplex stainless steel is an example of composite material with approximately equal amounts of austenite and ferrite phases. Difference of physical and mechanical properties of component is additional factor that contributes appearance of residual stresses after welding of duplex steel plates. Measurements of stress distributions in weld region were made by
Mat. Res.. Publicado em: 15/04/2014
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9. The columnar to equiaxed transition of horizontal unsteady-state directionally solidified Al-Si alloys
Experiments were conducted to investigate the influence of thermal parameters on the columnar to equiaxed transition during the horizontal unsteady-state directional solidification of Al-Si alloys. The parameters analyzed include the heat transfer coefficients, growth rates, cooling rates, temperature gradients and composition. A combined theoretical and exp
Mat. Res.. Publicado em: 18/02/2014
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10. Characterization of the Al-3wt.%Si alloy in unsteady-state horizontal directional solidification
The main purpose of this paper is to investigate both the columnar to equiaxed transition and primary dendritic arm spacings of Al-3wt.%Si alloy during the horizontal directional solidification. The transient heat transfer coefficient at the metal-mold interface is calculated based on comparisons between the experimental thermal profiles in castings and the
Mat. Res.. Publicado em: 14/05/2013
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11. Características termorreguladoras no início da gestação e índices reprodutivos de matrizes suínas de diferentes ordens de parto / Thermoregulatory characteristics in early pregnancy and efficiency of sows of different parity orders
Objetivou-se com este estudo avaliar características termorreguladoras no início da gestação, bem como alguns índices reprodutivos de matrizes suínas de diferentes ordens de parto. Foram coletadas e analisadas frequência respiratória, temperatura retal, da pele de 98 matrizes de quatro grupos de ordens de parto: nulíparas, primíparas, segundo ao se
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 28/06/2012
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12. Tensiones residuales en uniones soldadas por FSW en aluminio 7075-T651
Residual stresses could be a relevant issue in the structural integrity of a component in service and usually have a major influence on their fatigue life, among other failure mechanisms. In recent years Friction-Stir Welding (FSW) has revolutionized the welding technology. Its main application has been given in aluminum alloys, but nowadays can be applicabl
Soldag. insp.. Publicado em: 2012-12